Studies of the Physical Phase,Crystal Cell Parameters and Grain size of Bi_xSr_(1-1.5x)TiO_3 Series Ceramics by X-ray diffraction

The physical phases,crystal cell parameters and crystal grain sizes of series ceramic samples BixSr1-1.5xTiO3(X=0.000,0.013,0.040,0.0533,0.100,0.133 and 0.167) prepared by solid phase reaction are measured by X-ray diffraction method.The results show that each sample is a ceramic of crystal grain sizes being 659～2078? and single crystal structure,and specifically: 1)for the Bi content x≤0.040,the crystal structure of the BixSr1-1.5xTiO3 samples belongs to the cubic crystal system of space group P23(195),and the cell volume increases slightly(~2%) with x;2) for x=0.053,the crystal structure turns to the tetragonal system of space group P4(75),but the cell volume only changes a little(~1%);3) To BixSr1-1.5xTiO3(x=0.100,0.133 and 0.167) samples,the crystal structure changes to the monoclinic system of space group PC(7),meantime the cell volumes rapidly reduce~20%.